What Is Bitcoin, Actually? A Plain English Explainer.

Published: 2024  |  Perspective updated: 2025

“I don't get it — it's some technology or crypto thing that's too confusing.”

“It's terrible for the planet because of the energy it uses.”

Both of these things are said about bitcoin regularly. Both contain a grain of truth. Neither is the whole picture. And given that bitcoin is now appearing in pension portfolios, showing up in mainstream financial conversations, and increasingly relevant to anyone who cares about the future of money and finance, it feels worth actually understanding what it is — without the hype in either direction.

What bitcoin is, at its most basic

Bitcoin is a form of digital money that exists on a decentralised network — meaning no single government, bank, or company controls it. It was created in 2009 by a person or group using the pseudonym Satoshi Nakamoto, and it operates on a technology called a blockchain: a public ledger that records every transaction, maintained by a distributed network of computers around the world.

The key innovation is that bitcoin allows two people to transfer value directly to each other — without a bank, without a payment processor, without a trusted third party — and that transfer is secured by cryptography and recorded permanently.

Every bitcoin transaction is verified by a network of computers (called miners) that compete to solve complex mathematical problems. The first to solve it gets to add the next block of transactions to the chain and receives newly created bitcoin as a reward. This process is called proof of work — and it is why bitcoin uses a significant amount of energy. The energy use is real. It is also more complicated than the headline suggests, with a growing proportion of bitcoin mining now powered by renewable energy sources, and ongoing debate about how bitcoin's energy use compares to the energy cost of the traditional financial system it partially competes with.

Why people use it

Bitcoin was designed as an alternative to traditional money — particularly in contexts where trust in governments or financial institutions is limited, or where access to the conventional banking system is restricted.

Its total supply is capped at 21 million coins, encoded in the protocol from the beginning. This scarcity is intentional: unlike government-issued currencies, which can be printed in unlimited quantities, bitcoin's supply cannot be inflated. For people living in countries with high inflation or currency instability, this makes it attractive as a store of value.

This is exactly what has driven explosive adoption in sub-Saharan Africa, where cryptocurrency — and particularly stablecoins pegged to the dollar — has become a practical financial tool for millions of people navigating currency depreciation and limited banking access. The bitcoin conversation in Lagos or Nairobi is very different from the one in London.

Bitcoin is also used for international transfers — sending money across borders without the fees and delays of the traditional banking system. The average cost of sending $200 to sub-Saharan Africa through conventional channels remains around 9% of the transaction value. Bitcoin and crypto alternatives can undercut that significantly.

What it is not

Bitcoin is not the same as other cryptocurrencies. There are thousands of other digital assets — Ethereum, Solana, various stablecoins — each with different designs, purposes, and risk profiles. When people say “crypto” they are often referring to a much broader and more varied category than bitcoin specifically.

Bitcoin is not primarily a tool for criminals, though it has been used for criminal purposes, as has cash. The blockchain's public nature actually makes bitcoin transactions more traceable than cash in many respects.

And bitcoin is not the same as a speculative technology startup. It has no CEO, no board, no employees, and no single point of failure. Whether it succeeds or fails as a technology depends on network effects and adoption — not on the decisions of any individual or institution.

Why it is worth understanding

A UK pension fund has now allocated to it. Several countries hold it as a reserve asset. Major financial institutions offer custody and investment products around it. The regulatory frameworks that govern how financial services can engage with it are still being developed.

Whether bitcoin ultimately becomes a mainstream part of the financial system or remains a niche asset class, understanding what it actually is — rather than filtering it through the loudest voices on either side of the debate — seems like useful knowledge for anyone working in finance, in policy, or simply thinking seriously about the future of money.

The linked article on what the UK's first pension fund bitcoin allocation actually means takes the institutional investment question further, if you want to go deeper.